2026-07-08, 06:56 PM
(2026-06-27, 09:38 AM)seandepagnier Wrote: 7.6m ohm seems reasonable, but 110.9mΩ doesn't make sense at 30 amps. This would dissipate more than 100 watts.
In my 30 amp controller the resistance is about 2-3mΩ for the shunt and mosfets on low side, but the connectors and fuse add another 4-5, so almost the same.
In my tests mine did not heat up more than 15C without cooling at 30 amps, so the controller you built is probably more comparable to the 15 amp one (medium power) size.
For a load I used stainless steel wires.
Sorry there was a typo. the total resistance of the board is estimated to about 11.09mΩ. This includes all the connectors, traces, internal MOSFET's Ron and shunts. Not sure how can you do lower with only 2 OZ boards.